CN117826337A

CN117826337A - FA-MPO ferrule assembly and method for reducing stress in optical module

Info

Publication number: CN117826337A
Application number: CN202211199780.8A
Authority: CN
Inventors: 李东华; 王宁; 张子文
Original assignee: Accelink Technologies Co Ltd
Current assignee: Accelink Technologies Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2024-04-05

Abstract

The invention provides an FA-MPO (fiber-optical fiber-MPO) ferrule assembly and a method for reducing stress in an optical module, wherein an FA end and an MPO ferrule are arranged on a PCB (printed circuit board) of the optical module, the FA end and the MPO ferrule are connected through an optical fiber group, the optical fiber group is divided into a first part, a second part and a third part, wherein the second part is positioned between the first part and the third part, and fixing glue is coated on the second part to shape the second part, and the first part and the third part of the optical fiber group are kept in a straight state, so that stress on the FA end caused by bending recovery of the optical fiber group is reduced.

Description

FA-MPO ferrule assembly and method for reducing stress in optical module

[ field of technology ]

The invention relates to the technical field of optical communication, and provides an FA-MPO ferrule assembly and method for reducing stress in an optical module.

[ background Art ]

With the rise of big data, artificial intelligence and material networks, the construction of ultra-large-scale data centers enters a high-speed development period, the corresponding explosive growth of data flow is presented, the demand of parallel high-speed optical modules also grows at a high speed, and the high-speed optical modules of 400G and 800G gradually enter the data center market. The optical Fiber Array (FA) with the characteristics of small volume, high density and the like is particularly suitable for multichannel high-speed optical modules with higher and higher integration level. Taking the current mainstream 400G (4X 100G) optical module as an example, the transceiver units respectively need 4 paths of optical signals, and if a free space optical path is used, the design is difficult to realize. The main flow scheme in the industry mostly uses an 8-core FA-MPO ferrule assembly to realize optical path input and output, and the 8-core ribbon optical fiber is difficult to be completely suitable in length, and is inevitably bent to a certain extent in a module, so that relatively large stress is introduced to the FA, the FA usually uses an adhesive technology to realize optical path coupling, the continuously acting stress has a relatively large influence on adhesive reliability, the optical path coupling value is reduced when the FA is light, and the FA is completely detached when the FA is heavy.

[ invention ]

The technical problem to be solved by the invention is that the optical fiber length in the optical module is difficult to be matched with the optical module, the optical fiber is bent to a certain extent in the optical module, relatively large stress is introduced to the FA, the continuously acting stress has relatively large influence on the reliability of adhesion, the optical path coupling value is poor when the optical fiber is light, and the FA is completely detached when the optical fiber is heavy.

The invention achieves the aim through the following technical scheme:

in a first aspect, there is provided an FA-MPO ferrule assembly for reducing stress in an optical module, comprising: FA end 1, optical fiber group 2, fixing glue 3 and MPO lock pin 4, wherein:

the FA terminal 1 comprises a receiving port 11 and a sending port 12;

the receiving port 11 is connected with the MPO ferrule 4 through the optical fiber group 2, and the receiving port 11 is connected with a receiving end chip 5 of a PCB (printed circuit board) and is used for receiving optical signals for the MPO ferrule 4;

the transmitting port 12 is connected with the MPO ferrule 4 through the other optical fiber group 2, and the transmitting port 12 is connected with a transmitting end chip 6 of the PCB and is used for transmitting optical signals for the MPO ferrule 4;

the MPO ferrule 4 is arranged on the PCB and is used for being connected with an MPO connector;

the optical fiber group 2 comprises a first part 21, a second part 22 and a third part 23, wherein the first part 21 and the third part 23 are positioned at two ends of the optical fiber group 2 and are respectively connected with the FA end 1 and the MPO ferrule 4, and the second part 22 is positioned between the first part 21 and the third part 23;

the fixing glue 3 is coated on a preset position of the second portion 22 of the optical fiber set 2, so as to shape the second portion 22 of the optical fiber set 2, keep the first portion 21 and the third portion 23 of the optical fiber set 2 in a straight state, and reduce stress on the FA end 1 caused by bending of the optical fiber set 2.

Preferably, the fixing glue 3 is coated on a preset position on the optical fiber group 2 to shape the optical fiber group 2, and specifically includes:

the fixing glue 3 is coated on the entire surface of the second portion 22 of the optical fiber group 2, and the fixing glue 3 is solidified under the condition that the second portion 22 of the optical fiber group 2 is kept in a preset shape, thereby completing the shaping;

when the shaped optical fiber group 2 is connected with the FA end 1 and the MPO ferrule 4 at two ends, the first part 21 and the third part 23 of the optical fiber group 2 are in a straight state;

the second portion 22 of the shaped optical fiber set 2 has a toughness that does not apply stress to the first portion 21 and the third portion 23 of the optical fiber set 2;

the horizontal distance between the two ends of the shaped optical fiber group 2 is matched with the horizontal distance between the FA end 1 and the MPO ferrule 4.

Preferably, the fixing glue 3 is coated on a preset position on the optical fiber group 2 to shape the optical fiber group 2, and further includes:

the fixing glue 3 is coated on the two ends of the second part 22 of the optical fiber group 2, and the two ends of the second part 22 are adhered to a PCB to finish shaping;

when the two ends of the shaped optical fiber group 2 are connected with the FA end 1 and the MPO ferrule 4, the first part 21 and the third part 23 of the optical fiber group 2 are in a straight state;

the stress applied to the two ends of the second portion 22 of the shaped optical fiber group 2 acts on the bonding position of the second portion 22, and the acting force does not act on the first portion 21 and the third portion 23;

Preferably, as shown in fig. 7, the upper end of the receiving port 11 is a receiving end V-groove 111, the lower end of the receiving port 11 is a receiving end glass cover plate 112, and one end of the optical fiber group 2 is fixed between the receiving end V-groove 111 and the receiving end glass cover plate 112, and is coupled with the receiving end chip 5 of the PCB board in the receiving port 11.

Preferably, the lower end of the transmitting port 12 is a transmitting end V-groove 121, and the upper end of the transmitting port 12 is a transmitting end glass cover plate 122; the other optical fiber group 2 is fixed between the transmitting end V-groove 121 and the transmitting end glass cover 122, and is coupled with the transmitting end chip 6 of the PCB board in the transmitting port 12.

Preferably, the optical fiber group 2 includes a preset number of optical fibers, and the preset number of optical fibers are arranged side by side.

Preferably, a metal guide pin 41 is disposed on the MPO ferrule 4, and the metal guide pin 41 is used for precisely positioning the MPO ferrule 4 and the MPO connector when the MPO ferrule 4 is connected with the MPO connector.

In a second aspect, a method of reducing stress in an optical module, the method of use employs the FA-MPO ferrule assembly that reduces stress in an optical module, wherein:

the MPO ferrule 4 is connected with an MPO connector;

the receiving port 11 is connected with the receiving end chip 5 of the PCB, receives optical signals and transmits the optical signals to the MPO connector;

the transmitting port 12 is connected with the transmitting end chip 6 of the PCB and transmits the optical signal of the MPO connector;

the fixing glue 3 is coated on a preset position of the second portion 22 of the optical fiber set 2, so as to shape the second portion 22 of the optical fiber set 2, keep the first portion 21 and the third portion 23 of the optical fiber set 2 in a straight state, and reduce stress on the FA end 1 caused by bending recovery of the optical fiber set 2.

Preferably, when the difference between the distance between the FA end 1 and the MPO ferrule 4 and the length of the optical fiber set 2 is greater than a first preset difference, the fixing glue 3 is coated on the entire surface of the second portion 22 of the optical fiber set 2, and the fixing glue 3 is solidified under the condition that the second portion 22 of the optical fiber set 2 is kept in a preset shape, thereby completing the shaping;

Preferably, when the difference between the distance between the FA end 1 and the MPO ferrule 4 and the length of the optical fiber set 2 is greater than a second preset difference and less than or equal to a first preset difference, the fixing glue 3 is coated at two ends of the second portion 22 of the optical fiber set 2, and the two ends of the second portion 22 are bonded on a PCB board to complete shaping;

the stress applied to the two ends of the second portion 22 of the shaped optical fiber group 2 acts on the bonding position of the second portion 22 and is abutted, and does not act on the first portion 21 and the second portion 22;

The invention provides an FA-MPO (fiber-optical-fiber-MPO) ferrule assembly and a method for reducing stress in an optical module, wherein an FA end 1 and an MPO ferrule 4 are arranged on a PCB (printed circuit board) of the optical module, the FA end 1 is connected with the MPO ferrule 4 through an optical fiber group 2, the optical fiber group 2 is divided into a first part 21, a second part 22 and a third part 23, wherein the second part 22 is positioned between the first part 21 and the third part 23, a fixing glue 3 is coated on the second part 22 so as to shape the second part 22, the first part 21 and the third part 23 of the optical fiber group 2 are kept in a straight state, so that the length space occupied by the optical fiber group 2 is reduced, the length space occupied by the optical fiber group 22 is matched with the optical module, the bending of the optical fiber group 2 is avoided as much as possible, the stress caused by the bending is avoided, the influence of acting force on the first part 21 and the third part 23 of the optical fiber group 2 is reduced, the FA or the FA is prevented from loosening, the reliability of optical fiber group 2 and the coupling of an optical path is ensured, and the coupling value of the optical path is expected.

[ description of the drawings ]

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments of the present invention will be briefly described below. It is evident that the drawings described below are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic structural diagram of an FA-MPO ferrule assembly for reducing stress in an optical module mounted on an optical module PCB according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another FA-MPO ferrule assembly for reducing stress in an optical module according to an embodiment of the present invention mounted on an optical module PCB;

FIG. 3 is a top view of an FA-MPO ferrule assembly for reducing stress in an optical module according to an embodiment of the present invention;

FIG. 4 is a top view of an exemplary bonding scheme for an FA-MPO ferrule assembly for reducing stress in an optical module according to an embodiment of the present invention;

FIG. 5 is a top view of another bonding scheme for an FA-MPO ferrule assembly for reducing stress in an optical module according to an embodiment of the present invention;

FIG. 6 is a top view of an alternative bonding scheme for an FA-MPO ferrule assembly for reducing stress in an optical module according to an embodiment of the present invention;

FIG. 7 is a top view of another bonding scheme for an FA-MPO ferrule assembly for reducing stress in an optical module according to an embodiment of the present invention;

FIG. 8 is a side view of an FA-MPO ferrule assembly for reducing stress in an optical module according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of an FA-MPO ferrule assembly for reducing stress in an optical module mounted on an optical module PCB with an optical fiber fixing frame according to an embodiment of the present invention;

FIG. 10 is a top view of yet another bonding scheme for an FA-MPO ferrule assembly for reducing stress in an optical module in accordance with an embodiment of the present invention;

wherein, the reference numerals are as follows:

FA end 1; an optical fiber group 2; a fixing adhesive 3; MPO ferrule 4; a receiving port 11; a transmission port 12; a receiving end chip 5; a transmitting end chip 6; a first portion 21; a second portion 22; a third portion 23; a receiving end V groove 111; a receiving end glass cover plate 112; a transmitting end V groove 121; a transmitting end glass cover plate 122; a metal lead 41; an optical fiber fixing frame 7; a first optical fiber 81; a second optical fiber 82; and a fusion point 9.

[ detailed description ] of the invention

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

In the description of the present invention, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", "left", "right", etc. refer to the orientation or positional relationship based on that shown in the drawings, only for convenience in describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other. The invention will be described in detail below with reference to the drawings and examples.

Example 1:

the embodiment of the invention provides an FA-MPO ferrule assembly for reducing stress in an optical module;

as shown in fig. 1-3, comprising: FA end 1, optical fiber group 2, fixing glue 3 and MPO lock pin 4, wherein:

the FA terminal 1 comprises a receiving port 11 and a sending port 12;

the receiving port 11 is connected with the MPO ferrule 4 through the optical fiber group 2, and the receiving port 11 is used for being connected with a receiving end chip 5 of a PCB;

the transmitting port 12 is connected with the MPO ferrule 4 through the other optical fiber group 2, and the transmitting port 12 is used for being connected with a transmitting end chip 6 of the PCB;

the fixing glue 3 is coated on a preset position of the second portion 22 of the optical fiber set 2 to shape the second portion 22 of the optical fiber set 2, and keep the first portion 21 and the third portion 23 of the optical fiber set 2 in a straight state, so as to reduce the stress of the optical fiber set 2 on the FA end 1.

The optical fiber array is adopted by the FA, the PCB is a PCB in an optical module, the optical fiber group 2 consists of at least two optical fibers side by side, the MPOMuli-fiber PushOn is used for connecting with an MPO connector, a receiving port 11 of the FA end 1 is responsible for receiving optical signals from other optical modules and transmitting the optical signals to a receiving end chip 5, and a transmitting port 12 of the FA end 1 is responsible for transmitting the optical signals transmitted by the transmitting end chip 6; the receiving end chip 5 and the transmitting end chip 6 are arranged at the position, close to the middle, of the upper surface of the PCB of the optical module, the MPO ferrule 4 is arranged at the edge position of the upper surface of the PCB, and the edge position of the upper surface of the PCB is opposite to the golden finger position of the PCB; the FA-MPO ferrule assembly comprises two optical fiber groups 2, one end of each optical fiber group 2 is connected with the MPO ferrule 4, the other end of one optical fiber group 2 is connected with the receiving port 11, and the other end of the other optical fiber group 2 is connected with the transmitting port 12; and the optical fiber groups 2 are led out from the upper surface of the PCB.

In general, the portion of the optical fiber set 2 having the greatest bending degree is usually the middle portion, and because the two ends of the optical fiber set 2 are connected to the FA end 1 and the MPO ferrule 4, respectively, in order to avoid the influence of stress, the two ends of the optical fiber set 2 must be in a straight state, and the middle portion of the optical fiber set 2 may be in a straight state or a bent state, so that the second portion 22 is the middle portion of the optical fiber set 2, and in order to avoid the bending or folding degree of the junction between the optical fiber sets 2 of different portions in the wire arrangement process from being too high, the length of the second portion 22 should be greater than the length of the first portion 21 and the third portion 23.

At present, most of the FA-MPO (fiber-optical-fiber-MPO) core-inserting assemblies with 8 cores are used for realizing the input and output of optical paths in the market, the strip-shaped optical fibers with 8 cores are difficult to match with the size of a PCB (printed circuit board) of an optical module due to the fact that the lengths of the optical fibers are long, when the FA-MPO core-inserting assemblies are arranged on the PCB of the optical module, the optical fiber group 2 is difficult to avoid bending to a certain extent, the FA end 1 in the FA-MPO core-inserting assemblies is usually coupled with a chip on the PCB through an adhesive process, the bending of the optical fiber group 2 can exert stress on the two ends of the FA end 1 and act on the connection part of the FA end 1 and the PCB, the adhesive stability of the connection part is affected, the optical path coupling value is degraded due to light, the FA is directly dropped due to heavy influence is larger for the optical module needing to be provided with a multi-core FA; in this embodiment, the fixing glue 3 is applied to the preset position of the second portion 22 of the optical fiber group 2, so that the second portion 22 of the optical fiber group 2 is shaped, so that the second portion 22 of the optical fiber group 2 will not stress the two ends due to bending of itself, and the first portion 21 and the third portion 23 of the optical fiber group 2 are ensured to be in a straight state, thereby avoiding affecting the FA end 1.

Wherein the preset position is set by a person skilled in the art according to the actual situation, and the connection positions of the two ends of the optical fiber group 2 can be ensured to be in a straight state, and the preferred reference scheme is provided in the following embodiments.

As shown in fig. 4 and 5, one of the shaping schemes of the optical fiber set 2 is as follows:

the fixing glue 3 is applied to a preset position on the optical fiber group 2 to shape the second portion 22 of the optical fiber group 2, and specifically includes:

the fixing glue 3 is coated on the whole surface of the second portion 22 of the optical fiber group 2, and the fixing glue 3 is solidified under the condition that the second portion 22 of the optical fiber group 2 is kept in a preset shape so as to finish shaping;

when the molded optical fiber set 2 is connected with the FA end 1 and the MPO ferrule 4 at two ends, the first part 21 and the third part 23 of the optical fiber set 2 are in a straight state;

the second portion 22 of the shaped optical fiber set 2 has toughness, and the horizontal distance between the two ends of the shaped optical fiber set 2 is matched with the horizontal distance between the FA end 1 and the MPO ferrule 4.

In this embodiment, the second portion 22 of the shaped optical fiber group 2 has toughness, and the second portion 22 is inclined to the first portion 21 and the third portion 22 respectively, so as to reduce the length space occupied by the optical fiber group 2, adapt the length space occupied by the optical fiber group 22 to the optical module, avoid bending the optical fiber group 2 as much as possible, avoid stress caused by bending, further reduce the stress suffered by the first portion 21 and the third portion 23 of the optical fiber group 2 as much as possible, reduce the influence of acting force on the adhesive, avoid FA falling or FA loosening, ensure the reliability of coupling between the optical fiber group 2 and the optical path, and make the coupling value of the optical path meet the expectations;

when the predetermined position is the entire surface of the second portion 22 of the optical fiber set 2, the process of applying the fixing glue 3 needs to be performed before the FA-MPO ferrule assembly is mounted on the PCB board, and this embodiment provides a preferred application process as follows:

according to the length of the optical fiber group 2 and the size of a PCB (printed circuit board) to be installed, on the premise that the size range of the PCB is not exceeded and elements on the PCB are not affected, designing a preset shape of the second part 22 of the optical fiber group 2, wherein the preset shape can be in a bent shape or a straight shape, clamping two ends of the second part 22 of the optical fiber group 2 through a fixing clamp, clamping the middle part of the second part 22 under the condition that the preset shape is relatively complex, ensuring that the optical fiber group 2 can maintain the preset shape under the clamping state of the fixing clamp, then coating fixing glue 3 on all non-clamping areas of the second part 22 of the optical fiber group 2, and maintaining the preset shape of the optical fiber group 2 under the clamping state until the fixing glue 3 on the optical fiber group 2 is completely solidified; since there is a region of the second portion 22 where the fixing glue 3 is not applied because of the clamping of the fixing jig, it is also necessary to apply the fixing glue 3 to the region and solidify the region, to ensure that the entire second portion 22 of the optical fiber group 2 can be entirely coated with the fixing glue 3, to clamp the fixing jig to the region of the second portion 22 to which the fixing jig has been applied, while maintaining the second portion 22 of the optical fiber group 2 in a preset shape, to apply the fixing glue 3 to the region of the second portion 22 which is not applied, and to maintain the preset shape in the clamped state until the fixing glue 3 on the optical fiber group 2 is entirely solidified, so that the second portion 22 of the optical fiber group 2 can be entirely coated with the fixing glue 3 and solidified by the solidified fixing glue 3 without an external force, and without causing a stress influence to both ends of the second portion 22. The fixing glue 3 is glue with quick and stable setting time, and the outer surface of the optical fiber is not damaged.

The preset shape is set by a person skilled in the art according to the actual situation, the preset shape is adapted to the size of the PCB board, the electronic components on the PCB board are not affected, and meanwhile, the horizontal distance between the two ends of the optical fiber group 2 can be adjusted to match the horizontal distance between the FA end 1 and the MPO ferrule 4, and the shape setting meeting the above conditions is within the protection scope of the present embodiment.

And after the optical fiber group 2 is molded, the FA-MPO ferrule assembly is installed on a PCB.

The straight state represents a state in which the corresponding optical fiber group 2 is not bent and is not stretched, but is a relatively natural straight line, and no stress is applied to both ends due to bending or stretching.

The horizontal distance between the two ends of the shaped optical fiber set 2 represents the sum of the horizontal distance between the two ends of the first portion 21, the horizontal distance between the two ends of the second portion 22 and the horizontal distance between the two ends of the third portion 23, the horizontal distance between the FA end 1 and the MPO ferrule 4 represents the horizontal distance between the receiving port 11 and the MPO ferrule 4 or the horizontal distance between the transmitting port 12 and the MPO ferrule 4, and the matching represents that the horizontal distance between the two ends of the optical fiber set 2 is slightly greater than the horizontal distance between the FA end 1 and the MPO ferrule 4, wherein the difference between the two is caused by the fact that a part of the optical fiber set 2 needs to be arranged inside the FA end 1 and the MPO ferrule 4 when the connection is performed, and the difference should be designed by a person skilled in the art during assembly installation to ensure good connection between the optical fibers and the FA end 1 and the MPO ferrule 4.

The optical fiber group 2 shaping scheme has the advantages that the PCB itself is not required to be changed in the shaping and fixing process of the optical fiber group 2, and the influence or damage to the PCB is avoided.

As shown in fig. 6, another optical fiber set 2 shaping scheme is as follows:

the fixing glue 3 is applied to a preset position on the optical fiber set 2 to shape the second portion 22 of the optical fiber set 2, and further includes:

the fixing glue 3 is coated on the two ends of the second part 22 of the optical fiber group 2, and the two ends of the second part 22 are adhered on the PCB to finish shaping;

the stress applied to the two ends of the second part 22 of the shaped optical fiber group 2 acts on the bonding position of the second part 22;

the horizontal distance between the two ends of the molded optical fiber set 2 is matched with the horizontal distance between the FA end 1 and the MPO ferrule 4.

In the present shaping scheme of the optical fiber group 2, the positions of the two ends of the second portion 22 are required to be set according to the layout of the electronic components on the PCB board, the positions of the two ends of the second portion 22 where the electronic components are not present are required to be selected, the stresses applied to the two ends are offset by the fixing points where the two ends are bonded according to the length of the optical fiber group 2 itself and the distance between the FA end 1 and the MPO ferrule 4, and the stresses applied to the two ends are not applied to the first portion 21 and the third portion 23 when the first portion 21 and the third portion 23 are ensured to be in a straight state, and the second portion 22 can be in a straight state or a curved state after the bonding is completed, if the second portion 22 is set in a straight state, the stresses are not applied to the two ends, and if the second portion 22 is in a curved state, the stresses applied to the two ends are not applied to the first portion 21 and the third portion 23.

The horizontal distance between the two ends of the shaped optical fiber set 2 represents the sum of the horizontal distance between the two ends of the first portion 21 and the horizontal distance between the two ends of the second portion 22 and the horizontal distance between the two ends of the third portion 23, the horizontal distance between the FA end 1 and the MPO ferrule 4 represents the horizontal distance between the receiving port 11 and the MPO ferrule 4 and the horizontal distance between the transmitting port 12 and the MPO ferrule 4, and the horizontal distance between the two ends of the matched optical fiber set 2 is slightly greater than the horizontal distance between the FA end 1 and the MPO ferrule 4, wherein the difference between the two is caused by the fact that a part of the optical fiber set 2 needs to be arranged inside the FA end 1 and the MPO ferrule 4 when the connection is performed, and the difference should be designed by a person skilled in the art during assembly installation to ensure good connection between the optical fibers and the FA end 1 and the MPO ferrule 4.

The optical fiber group 2 shaping scheme has the advantages of simpler operation and better effect of reducing stress.

The optical fiber group 2 comprises a preset number of optical fibers, and the preset number of optical fibers are arranged side by side.

The preset number is set by a person skilled in the art according to the actual situation requirement, and all the number settings that can be realized are within the protection scope of the embodiment.

As shown in fig. 7 and 8, the upper end of the receiving port 11 is a receiving end V-groove 111, the lower end of the receiving port 11 is a receiving end glass cover plate 112, and one end of the optical fiber group 2 is fixed between the receiving end V-groove 111 and the receiving end glass cover plate 112 and is coupled with the receiving end chip 5 of the PCB board in the receiving port 11.

The lower end of the transmitting port 12 is a transmitting end V-shaped groove 121, and the upper end of the transmitting port 12 is a transmitting end glass cover plate 122; the other optical fiber group 2 is fixed between the transmitting end V-groove 121 and the transmitting end glass cover 122, and is coupled with the transmitting end chip 6 of the PCB board in the transmitting port 12.

The MPO ferrule 4 is provided with a metal guide pin 41, and the metal guide pin 41 is used for accurately positioning the MPO ferrule 4 and the MPO connector when the MPO ferrule 4 is connected with the MPO connector.

The MPO ferrule 4 is used as a multi-channel high-density optical fiber connector, a plurality of pinholes through which controllable metal guide pins 41 pass are formed in the MPO ferrule 4, and the metal guide pins 41 are arranged on the MPO ferrule 4 and penetrate through the pinholes of the MPO ferrule 4 to realize precise positioning when the MPO ferrule 4 is connected with an external MPO connector.

Example 2:

in this embodiment, as shown in fig. 9, the optical fiber fixing frame 7 is further disposed on the PCB of the optical module, the optical fiber fixing frame 7 is a step groove, two ends of the second portion 22 of the optical fiber group 2 are disposed inside the groove of the optical fiber fixing frame 7 during installation, and two ends of the second portion 22 are disposed in the optical fiber fixing frame 7 by the fixing glue 3, so as to guide the optical fiber group 2 to travel on the PCB surface; since there are two fiber groups 2 in one FA-MPO ferrule assembly, at least 4 fiber holders 7 need to be provided on the PCB, and each 2 fiber holders 7 is used to hold two ends of the second portion 22 of 1 fiber group 2, respectively.

In this embodiment, the positions of the optical fiber fixing frames 7 are required to be set according to the layout of the electronic components on the PCB, the positions of the FA end 1 and the MPO ferrule 4 where no electronic components exist are required to be selected, and the two ends of the second portion 22 are fixed to the optical fiber fixing frames 7 and fixed by the fixing glue 3 under the condition that the first portion 21 and the third portion 23 are in a straight state after the installation is ensured, and the first portion 21 and the third portion 23 of the optical fiber group 2 are ensured to be in a straight state or a curved state, if the second portion 22 is set to be in a straight state, no stress is generated on the two ends, and if the second portion 22 is set to be in a curved state, the stress applied to the two ends is offset by the fixing points of the optical fiber fixing frames 7 at the two ends and does not act on the first portion 21 and the second portion 22.

At the same time, it is also necessary to ensure that the distance between the two ends of the installed optical fiber set 2 matches the distance between the FA end 1 and the MPO ferrule 4.

Example 3:

on the basis of the foregoing embodiments 1 and 2, a preferred device is also provided in this embodiment.

Since in conventional FA-MPO ferrule assemblies, 250 μm diameter fibers are typically used, which are larger in diameter, for multi-core FA-MPO ferrule assemblies the stress caused by bending of the fibers is typically larger, in this embodiment the outer fibers are chosen to be replaced with 160 μm diameter fibers, while 250 μm diameter fibers are still used inside the FA end 1 and inside the MPO ferrule 4, and the stress generated by bending of 160 μm diameter fibers is smaller than that generated by 250 μm diameter fibers.

As shown in fig. 10, the 250 μm diameter optical fiber is a first optical fiber 81 in this embodiment, the cladding diameter of which is 125 μm; the 160 μm diameter optical fiber is in this embodiment the second optical fiber 82 with a cladding diameter of 80 μm.

The first optical fiber 81 and the second optical fiber 82 are excessively fused, as shown in fig. 10, the fusion point 9 is respectively located in the receiving port 11 and the transmitting port 12 of the FA end 1 and in the MPO ferrule 4, so that the portion of the whole optical fiber group 2, which is easy to bend, is replaced by the second optical fiber 82, and the stress influence caused by the optical fiber group 2 is further reduced.

Example 4:

on the basis of the foregoing embodiments, the present embodiment provides a method for reducing stress in an optical module.

The MPO ferrule 4 is connected with an MPO connector;

Because the difference of the distance between the optical fiber group 2 and the MPO ferrule 4 is larger or smaller than the difference of the distance between the FA end 1 and the MPO ferrule 4 in different situations, the optical fibers need to be prevented from being directly folded or bent too strongly, so that damage to the optical fibers is avoided, when the difference of the distance between the optical fiber group 2 and the FA end 1 and the MPO ferrule 4 is larger, the second portion 22 of the optical fiber group 2 may need to be bent more, and the bending portion cannot be folded too much relative to the first portion 21 and the second portion 22 of the optical fiber group 2, in the two shaping modes in embodiment 1, the second portion 22 is entirely coated with the fixing glue 3 and solidified, the overall shaping shape of the optical fiber group 2 can be better customized, the bending degree of each part of the optical fiber group 2 can be adjusted manually, and the bending position is prevented from being too strong, and the other mode of fixing the setting position of the optical fiber group 2 on the PCB board through the fixing glue 3 can only control the positions of a few adhered points in the optical fiber group 2, and cannot control the overall shape of the optical fiber group 2 more finely, and the overall shape of the optical fiber group 2 cannot be matched with the optical fiber group 2 in the same distance between the FA end 1 and the second portion 2 and the MPO ferrule 4 in the same condition that the distance between the optical fiber group 2 and the optical fiber end 2 and the optical fiber 4 is smaller than the optical fiber end 2 is fixed in the same as the first portion 2 and the optical fiber 4, and the optical fiber 2 is set 2 in the 3, and the optical fiber has the same condition that the distance between the optical fiber group 2 is set 2 and the optical fiber has the length has the same length and the optical fiber 2.

When the difference between the distance between the FA end 1 and the MPO ferrule 4 and the length of the optical fiber set 2 is greater than a first preset difference, the fixing glue 3 is coated on the whole surface of the second portion 22 of the optical fiber set 2, and the fixing glue 3 is solidified under the condition that the second portion 22 of the optical fiber set 2 is kept in a preset shape, so that shaping is completed;

When the difference between the distance between the FA end 1 and the MPO ferrule 4 and the length of the optical fiber set 2 is larger than a second preset difference and smaller than or equal to a first preset difference, the fixing glue 3 is coated at the two ends of the second part 22 of the optical fiber set 2, and the two ends of the second part 22 are adhered to a PCB to finish shaping;

The first preset difference value is smaller than the second preset difference value, and the first preset difference value and the second preset difference value should be set by a person skilled in the art according to one or more factors of the size of the PCB board, the distance between the FA end 1 and the MPO ferrule 4, the length of the optical fiber group 2, and the optical fiber model in the current scenario, and all the numerical settings that meet the above conditions and are applicable are within the protection scope of the present embodiment.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. An FA-MPO ferrule assembly for reducing stress in an optical module, comprising: FA end (1), optical fiber group (2), fixed glue (3) and MPO lock pin (4), wherein:

the FA terminal (1) comprises a receiving port (11) and a sending port (12);

the receiving port (11) is connected with the MPO ferrule (4) through the optical fiber group (2), and the receiving port (11) is used for being connected with a receiving end chip (5) of the PCB;

the transmitting port (12) is connected with the MPO ferrule (4) through the other optical fiber group (2), and the transmitting port (12) is used for being connected with a transmitting end chip (6) of the PCB;

the MPO ferrule (4) is arranged on the PCB and is used for being connected with the MPO connector;

the optical fiber group (2) comprises a first part (21), a second part (22) and a third part (23), wherein the first part (21) and the third part (23) are positioned at two ends of the optical fiber group (2) and are respectively connected with the FA end (1) and the MPO ferrule (4), and the second part (22) is positioned between the first part (21) and the third part (23);

the fixing glue (3) is coated at a preset position of the second part (22) of the optical fiber group (2) so as to shape the second part (22) of the optical fiber group (2), and the first part (21) and the third part (23) of the optical fiber group (2) are kept in a straight state so as to reduce the stress of the optical fiber group (2) on the FA end (1).

2. FA-MPO ferrule assembly for reducing stress in optical modules according to claim 1, characterized in that the fixing glue (3) is applied in a predetermined position on the optical fiber set (2) for shaping the second portion (22) of the optical fiber set (2), in particular comprising:

the fixing glue (3) is coated on the whole surface of the second part (22) of the optical fiber group (2), and the fixing glue (3) is solidified under the condition that the second part (22) of the optical fiber group (2) is kept in a preset shape so as to finish shaping;

when the molded optical fiber set (2) is connected with the FA ends (1) at the two ends and the MPO ferrule (4), a first part (21) and a third part (23) of the optical fiber set (2) are in a straight state;

the second portion (22) of the shaped optical fiber group (2) has toughness, and the horizontal distance between the two ends of the shaped optical fiber group (2) is matched with the horizontal distance between the FA end (1) and the MPO ferrule (4).

3. The FA-MPO ferrule assembly for reducing stress in an optical module according to claim 2, wherein the fixing glue (3) is applied to a predetermined location on the optical fiber set (2) for shaping the second portion (22) of the optical fiber set (2), further comprising:

the fixing glue (3) is coated at the two ends of the second part (22) of the optical fiber group (2), and the two ends of the second part (22) are adhered to the PCB to finish shaping;

the stress applied to the two ends of the second part (22) of the molded optical fiber group (2) acts on the bonding position of the second part (22);

the horizontal distance between the two ends of the molded optical fiber group (2) is matched with the horizontal distance between the FA end (1) and the MPO ferrule (4).

4. The FA-MPO ferrule assembly of claim 1, wherein the receiving port (11) has a receiving V-groove (111) at an upper end and a receiving glass cover (112) at a lower end, and wherein the optical fiber set (2) is fixed between the receiving V-groove (111) and the receiving glass cover (112) at one end and coupled to a receiving chip (5) of a PCB board in the receiving port (11).

5. The FA-MPO ferrule assembly for reducing stress in an optical module according to claim 1, wherein the lower end of the transmit port (12) is a transmit end V-groove (121), and the upper end of the transmit port (12) is a transmit end glass cover plate (122); the other optical fiber group (2) is fixed between the transmitting end V-groove (121) and the transmitting end glass cover plate (122) and is coupled with the transmitting end chip (6) of the PCB board in the transmitting port (12).

6. FA-MPO ferrule assembly for reducing stress in an optical module according to claim 1, characterized in that the optical fiber group (2) comprises a preset number of optical fibers arranged side by side.

7. FA-MPO ferrule assembly for reducing stress in an optical module according to claim 1, characterized in that the MPO ferrule (4) is provided with metal pins (41), which metal pins (41) are used for precisely positioning the MPO ferrule (4) with an MPO connector when the MPO ferrule (4) is connected with the MPO connector.

8. A method of reducing stress in an optical module, the method being applied to the FA-MPO ferrule assembly of any one of claims 1-7, wherein:

the MPO ferrule (4) is connected with an MPO connector;

the receiving port (11) is used for being connected with a receiving end chip (5) of the PCB;

the transmitting port (12) is used for being connected with a transmitting end chip (6) of the PCB;

the fixing glue (3) is coated on a preset position of the second part (22) of the optical fiber group (2), the second part (22) of the optical fiber group (2) is shaped, the first part (21) and the third part (23) of the optical fiber group (2) are kept in a straight state, and stress on the FA end (1) caused by bending recovery of the optical fiber group (2) is reduced.

9. The method of reducing stress in an optical module according to claim 8, wherein the fixing glue (3) is applied to the entire surface of the second portion (22) of the optical fiber group (2) when the difference between the distance between the FA end (1) and the MPO ferrule (4) and the length of the optical fiber group (2) is greater than a first preset difference, and the fixing glue (3) solidifies to complete the shaping while the second portion (22) of the optical fiber group (2) remains in a preset shape;

when the shaped optical fiber group (2) is connected with the FA ends (1) at the two ends and the MPO ferrule (4), the first part (21) and the third part (23) of the optical fiber group (2) are in a straight state;

10. The method for reducing stress in an optical module according to claim 9, wherein when the difference between the distance between the FA end (1) and the MPO ferrule (4) and the length of the optical fiber set (2) is greater than a second preset difference and less than or equal to a first preset difference, the fixing glue (3) is coated on two end positions of the second portion (22) of the optical fiber set (2), and the two end positions of the second portion (22) are bonded on a PCB board to complete the shaping;

the stress applied to the two ends of the second part (22) of the shaped optical fiber group (2) acts on the bonding position of the second part (22);

the horizontal distance between the two ends of the shaped optical fiber group (2) is matched with the horizontal distance between the FA end (1) and the MPO ferrule (4).